● In almost all cases the instrument runs in Input mode.
(Accelerometer and gyro sensors can only work in Input mode.)
Input mode means: the instrument records the raw voltage curve from the sensor and treats it as the travel curve; the curve itself carries no length information. We simply assign the manufacturer-specified travel length to the difference between the curve’s start and end points.

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● Measurement mode is used only in rare cases.

✔ Linear sensor + Measurement mode: you must enter the sensor’s electrical length. During breaker operation the wiper moves with the mechanism, so the sensor acts as a calibrated ruler. The instrument converts the wiper voltage into exact travel values to build the stroke curve. (Therefore the sensor must be rigidly fixed—any wobble will make the recorded travel unstable.)

✔ Analog rotary + Measurement mode: set the sensor length as follows
Sensor length (mm) = (theoretical stroke in mm ÷ theoretical angle in degrees) × 345°

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Self-check: No sensor signal / Is the sensor faulty?
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Older Inaccurate measurement of opening and closing time in opening and closing tests/Setting of control time in opening and closing tests

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